<!-- 登陆成功后的首页 -->
<template>
    <el-container class="home-container">
    <!-- 页面头部区域 -->
    <el-header>
        <div>
            <img src="../assets/heima.png" alt="">
            <span>电商后台管理系统</span>
        </div>
        <el-button @click="logout" type="info">退出</el-button>
    </el-header>
    
    <!-- 页面主体区域 -->
    <el-container>
        <!-- 左侧边栏区域 -->
        <el-aside :width="iscollapse ? '64px':'200px'">
            <div class="toggle-button" @click="toggleCollapse">|||</div>
            <el-menu background-color="#333744" text-color="#fff" active-text-color="#409EFF" 
            :unique-opened="true" 
            :collapse="iscollapse" :collapse-transition="false"
            :router="true" 
            :default-active="activeIndex">
                <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
                    <template slot="title">
                        <i :class="iconsObj[item.id]"></i>
                        <span>{{item.authName}}</span>
                    </template>
                    <el-menu-item :index="'/'+ subitem.path" 
                    v-for="subitem in item.children" :key="subitem.id"
                    @click="saveNavIndex('/'+ subitem.path)">
                        <i class="el-icon-menu"></i>
                        <span>{{subitem.authName}}</span>
                    </el-menu-item>
                </el-submenu>
            </el-menu>
        </el-aside>
        
        <!-- 右侧内容主体区域 -->
        <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>
        </el-main>
    </el-container>
    </el-container>
</template>

<script>
export default {
    data() {
        return {
            // 左侧菜单数据
            menulist:[],
            iconsObj:{
                '125':'iconfont icon-user',
                '103':'iconfont icon-tijikongjian',
                '101':'iconfont icon-shangpin',
                '102':'iconfont icon-danju',
                '145':'iconfont icon-baobiao'
            },
            // 是否将左侧边栏折叠
            iscollapse:false,
            activeIndex:''

        }
    },
    created(){
        this.getMenuList();
        this.activeIndex = window.sessionStorage.getItem('activeIndex');
    },
    methods:{
        logout(){
            window.sessionStorage.clear();
            this.$router.push('/login');
        },
        //获取所有的菜单
        async getMenuList(){
            const {data:res} = await this.$http.get('menus');
            if(res.meta.status != 200)
                return this.$message.error(res.meta.msg);
            this.menulist = res.data;
            
        },
        // 点击按钮，控制左侧侧边栏的折叠与展开
        toggleCollapse(){
            this.iscollapse = !this.iscollapse;
        },
        // 保存二级菜单的index值
        saveNavIndex(activeIndex){
            window.sessionStorage.setItem('activeIndex',activeIndex);
            this.activeIndex = activeIndex;
        }
    }
    
}
</script>

<style lang='less' scoped>
    .home-container{
        height: 100%;
    }
    .el-header{
        background-color: #373d41;
        display: flex;
        justify-content: space-between;
        padding-left: 0;
        align-items: center;
        color: #fff;
        font-size: 20px;
        > div{
            display: flex;
            align-items: center;
            span{
                margin-left: 15px;
            }
        }
    }
    .el-aside{
        background-color: #333744;
        .el-menu{
            border-right: none;
        }
    }
    .el-main{
        background-color: #eaedf1;
    }
    .iconfont{
        margin-right: 10px;
    }
    .toggle-button{
        background-color: #4a5064;
        color: #fff;
        font-size: 10px;
        line-height: 24px;
        text-align: center;
        letter-spacing: 0.2em;
        cursor: pointer;

    }
</style>